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What are the factors that affect the efficiency of ultrasonic cleaning machines
Time of Update: 2022-10-13
5W/cm2); High-power products are mostly used for hardware, machinery and other industries or heavy pollution of general objects cleaning (ultrasonic power of 0.
5W/cm2); High-power products are mostly used for hardware, machinery and other industries or heavy pollution of general objects cleaning (ultrasonic power of 0.
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Effects of extreme snowfall events on litter respiration in subtropical evergreen broad-leaved forests
Time of Update: 2022-10-13
The findings, titled Responses of aboveground litterfall respiration to unexpected snowfall events in Ailao subtropical forests in Southwest China, were published in Applied Soil Ecology 。 The research has received strong support from the National Foundation, the Yunnan Provincial Fund, the 135 Project of the Chinese Academy of Sciences, the Key Laboratory of Tropical Forest Ecology of the Chinese Academy of Sciences and the Ailao Mountain Ecological Station.
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my country's H12MDA green preparation technology ranks at the international advanced level
Time of Update: 2022-09-07
, Ltd. and the Institute of Process Engineering, Chinese Academy of Sciences jointly developed the MDA catalytic hydrogenation green preparation H12MDA technology, which passed the achievement appraisal organized by the Shaanxi Petroleum and Chemical Industry Federation in Xi'an.
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Fantastic, plastic turns into spice
Time of Update: 2022-09-01
Guoliang Liu and colleagues at Virginia Tech have developed a way to break down polystyrene and convert it into a more valuable chemical .
Guoliang Liu and colleagues at Virginia Tech have developed a way to break down polystyrene and convert it into a more valuable chemical .
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Evonik launches POLYVEST® eCO, a sustainable bio-based liquid polybutadiene
Time of Update: 2022-08-17
"By developing POLYVEST® eCO, we want to support the transition to a circular and bioeconomy ," said Dr. Jürgen Herwig, head of Evonik's POLYVEST® global business.
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Nuciferine
Time of Update: 2022-06-01
Thin layer plate silica gel G plateDeveloping solvent n-butanol 36% acetic acid - water (1 pixel in horizontal) supernatantCheck under ultraviolet light (254nm, 365nm); check under sunlight after dilute potassium bismuth iodide develops color2.
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How to maintain the fully enclosed refrigeration and heating cycle device
Time of Update: 2022-05-01
The surface temperature of the casing of the fully enclosed refrigeration and heating cycle device exceeds the normal range, mainly because the suction temperature of the refrigeration system is too high, and the excessively high hot steam enters the compressor.
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Neurology: Magnetic resonance spectroscopy analysis of hypoxic-ischemic encephalopathy after cardiac arrest: decreased total NAA/CR and increased LAC/CR, increasing the risk of irreversible
Time of Update: 2022-03-05
N-acetyl-aspartate (NAA) choline (cho) Recently, researchers detected metabolites in coma patients after cardiac arrest and assessed 1) the difference between patients with good/poor recovery from coma; Bring back (PCQ), parietal white matter (PWM), basal ganglia (BG) and brain stem (BS) .
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Imidazolinone corrosion inhibitor
Time of Update: 2021-12-06
[Preparation method] The synthesis of imidazolinone corrosion inhibitor can be divided into two steps, the reaction formula is as follows ①Synthesis of imidazolinone In a 250mL three-necked flask, add 30.
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Poly-N-dimethylaminopropyl methacrylamide
Time of Update: 2021-10-21
6L flask containing 170g of N-dimethylaminopropyl methacrylamide, add 60g of acetic acid and 176g of water.
Quaternary ammonium acetate with the following structure can be obtained: (3) AggregationDilute 50 g of the methacrylamidopropyl hydroxyethyl dimethyl ammonium acetate aqueous solution prepared above with 50 g of deionized water, then fill with nitrogen at 30°C for 1 hour, and then add 0.
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The production principle and technological process of N,N-dimethylethanolamine
Time of Update: 2021-08-29
(3) Chloroethanol can also be directly added dropwise to dimethylamine, the yield is 85%, the production process is: add 40% dimethylamine solution to the reaction pot, adjust the temperature to 30-40 ℃, drop 95% Chloroethanol, keep stirring at 40～60℃ for 2h .
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Jianghan Engineering's underground test set a new record for Asia's first deep well construction
Time of Update: 2021-06-04
The supporting integrated pipe string was successfully lowered to 9,300 meters, and the depth of the open hole packer was 8376.
In view of the difficulties of ultra-deep high temperature, long open-hole section, complex well diameter, etc.
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Epoxy Resin Weekly Review: Losing Domineering
Time of Update: 2021-04-24
Epoxy resin manufacturers and market merchants continued to stabilize their prices and wait and see, pay close attention to the changes in the two major raw materials, supported by high-cost production costs in the early stage , Manufacturers have no intention to ship at low prices, and there is no hope for continued growth in the near future, and there is no shortage of floating space for shipments.
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The effect of amber acid dehydrogenase and the observation of competitive inhibition
Time of Update: 2020-10-23
Such as the heart muscle of the amber acid dehydrogenase in the absence of oxygen, can make the amber acid dehydrogenation to produce yanhuso acid, the hydrogen can be reduced to blue methylene blue into colorless toluene white.
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Coating knowledge literacy: discoloration mechanism of temperature indicating coating
Time of Update: 2020-04-03
Core tip: temperature indicating coating is a kind of special coating which uses color change to measure the surface temperature and temperature distribution of objects The principle is that when the
